Disadvantages of Prefabricated Houses
The disadvantages of prefabricated houses are mainly reflected in the following aspects:
1. Insufficient seismic performance Prefabricated houses are mainly composed of cement components. Although steel bars are added, their density is much lower than that of cast-in-place structures, and their overall integrity is poor. The connections between panels and between panels and walls are not firm. In the event of an earthquake, they are prone to instant separation and collapse, lacking crack warnings and deformation buffers, and offering few escape opportunities. The hollow design of the prefabricated panels further weakens their seismic capacity, resulting in significantly inadequate safety precautions in the face of natural disasters.
2. Poor sound insulation and thermal insulation effects The walls and floors of prefabricated houses have weak thermal insulation properties. In summer, the indoor environment is as stuffy as a "steamer", with temperatures reaching up to forty or fifty degrees Celsius, making it difficult for air conditioners to cool the space. In winter, it is as cold as a "refrigerator", with poor heating effects and high energy consumption. At the same time, the sound insulation effect is poor, and the sounds of neighbors' activities can be clearly heard, seriously affecting living comfort and posing health risks.
3. Difficult to adjust the internal structure The walls of prefabricated houses are mostly load-bearing structures. Large-scale modifications may damage the overall stability, making it difficult for residents to customize the spatial layout according to their needs, with flexibility far lower than that of modern commercial housing.
4. High risk of water seepage Cement components are prone to cracks over time. Improper joint treatment can lead to water seepage on roofs and walls, and this problem is difficult to completely solve. Water leakage between floors occurs frequently.
5. Short service life The design life of prefabricated houses is usually 30-50 years. Most of them were built in the 1970s and 1980s of the 20th century and are now approaching or have exceeded their service lives. Aging is widespread, posing safety hazards.
6. Vulnerable connection points Prefabricated panels are simply lapped with walls, and the joint filling between panels lacks rigid frameworks (such as ring beams and structural columns). Foundation settlement or wall cracking can cause panel misalignment and loosening. Weathering at the connections and reduced strength due to steel bar corrosion may trigger a chain collapse.
7. Shoddy materials Some small workshops, in order to reduce costs, use thin steel wires instead of steel bars, and the concrete grades do not meet the standards and are of insufficient thickness. This leads to brittle failure of the prefabricated panels, which can instantly break when exceeding the load-bearing capacity without any warning, posing extremely high safety risks.
